Pens
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Bluelab pH Pen
Original price $126.14Original price $126.14 - Original price $126.14Original price $126.14Current price $81.99$81.99 - $81.99Current price $81.99Measures pH and temperature. Selectable units for °C & °F. Backlit LCD display. Double junction probe (not replaceable). Successful calibration...
View full detailsOriginal price $126.14Original price $126.14 - Original price $126.14Original price $126.14Current price $81.99$81.99 - $81.99Current price $81.99 -
Bluelab PPM Pen
Original price $104.94Original price $104.94 - Original price $104.94Original price $104.94Current price $68.21$68.21 - $68.21Current price $68.21Measures conductivity and temperature. Selectable units for conductivity and temperature. Backlit LCD display with low battery warning. Successful ...
View full detailsOriginal price $104.94Original price $104.94 - Original price $104.94Original price $104.94Current price $68.21$68.21 - $68.21Current price $68.21 -
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Oakton Waterproof EcoTestr pH 1
Original price $77.02Original price $77.02 - Original price $77.02Original price $77.02Current price $45.95$45.95 - $45.95Current price $45.95Original price $77.02Original price $77.02 - Original price $77.02Original price $77.02Current price $45.95$45.95 - $45.95Current price $45.95Out of Stock -
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Bluelab Soil pH Pen
Original price $210.94Original price $210.94 - Original price $210.94Original price $210.94Current price $137.11$137.11 - $137.11Current price $137.11Original price $210.94Original price $210.94 - Original price $210.94Original price $210.94Current price $137.11$137.11 - $137.11Current price $137.11Out of Stock -
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Rapitest Mini pH Tester
Original price $6.30 - Original price $6.30Original price$6.30$6.30 - $6.30Current price $6.30Original price $6.30 - Original price $6.30Original price$6.30$6.30 - $6.30Current price $6.30Out of Stock -
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Rapitest Soil Test pH N,P,K (6-Cs)
Original price $13.99 - Original price $13.99Original price$13.99$13.99 - $13.99Current price $13.99Original price $13.99 - Original price $13.99Original price$13.99$13.99 - $13.99Current price $13.99Out of Stock -
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Rapitest pH Soil Tester (12-Cs)
Original price $4.49Original price $4.49 - Original price $4.49Original price $4.49Current price $4.33$4.33 - $4.33Current price $4.33Original price $4.49Original price $4.49 - Original price $4.49Original price $4.49Current price $4.33$4.33 - $4.33Current price $4.33Out of Stock -
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Luster Leaf Rapitest 4 Way Analyzer (3-Cs)
Original price $27.99 - Original price $27.99Original price$27.99$27.99 - $27.99Current price $27.99Original price $27.99 - Original price $27.99Original price$27.99$27.99 - $27.99Current price $27.99Out of Stock -
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Sure Test Base pH Pen +-- 0.3
Original price $0.00 - Original price $0.00Original price $0.00$33.99$33.99 - $33.99Current price $33.99Original price $0.00 - Original price $0.00Original price $0.00$33.99$33.99 - $33.99Current price $33.99Out of Stock -
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Oakton Waterproof EcoTestr pH 2
Original price $68.32 - Original price $68.32Original price$68.32$68.32 - $68.32Current price $68.32Original price $68.32 - Original price $68.32Original price$68.32$68.32 - $68.32Current price $68.32Out of Stock -
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Sure Test Commercial pH - EC - TDS - ORP Lab Meter
Original price $0.00 - Original price $0.00Original price $0.00$356.99$356.99 - $356.99Current price $356.99Original price $0.00 - Original price $0.00Original price $0.00$356.99$356.99 - $356.99Current price $356.99Out of Stock -
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Sure Test Pro EC - TDS Pen
Original price $0.00 - Original price $0.00Original price $0.00$24.99$24.99 - $24.99Current price $24.99Original price $0.00 - Original price $0.00Original price $0.00$24.99$24.99 - $24.99Current price $24.99Out of Stock -
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Sure Test Pro pH Pen w- Replaceable Probe +-- 0.05 ATC
Original price $0.00 - Original price $0.00Original price $0.00$78.99$78.99 - $78.99Current price $78.99Original price $0.00 - Original price $0.00Original price $0.00$78.99$78.99 - $78.99Current price $78.99Out of Stock -
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Sure Test Base Plus pH Pen +-- 0.05 ATC
Original price $0.00 - Original price $0.00Original price $0.00$28.99$28.99 - $28.99Current price $28.99Original price $0.00 - Original price $0.00Original price $0.00$28.99$28.99 - $28.99Current price $28.99Out of Stock -
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Sure Test Commercial Multi-Meter w- pH Conductivity Probes (DO Probe Sold Separately)
Original price $106.99 - Original price $106.99Original price$106.99$106.99 - $106.99Current price $106.99Original price $106.99 - Original price $106.99Original price$106.99$106.99 - $106.99Current price $106.99Out of Stock -
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HM Digital Brix Refractometer
Original price $0.00 - Original price $0.00Original price $0.00$231.09$231.09 - $231.09Current price $231.09Special order item; may take up to two weeks before it ships.
Original price $0.00 - Original price $0.00Original price $0.00$231.09$231.09 - $231.09Current price $231.09Out of Stock -
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Oakton Waterproof EcoTester pH 2+
Original price $0.00 - Original price $0.00Original price $0.00$68.02$68.02 - $68.02Current price $68.02Original price $0.00 - Original price $0.00Original price $0.00$68.02$68.02 - $68.02Current price $68.02Out of Stock -
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Milwaukee pH Controller
Original price $161.99 - Original price $161.99Original price$161.99$161.99 - $161.99Current price $161.99Original price $161.99 - Original price $161.99Original price$161.99$161.99 - $161.99Current price $161.99Out of Stock -
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Oakton Waterproof EcoTestr TDS Low
Original price $65.27 - Original price $65.27Original price$65.27$65.27 - $65.27Current price $65.27Original price $65.27 - Original price $65.27Original price$65.27$65.27 - $65.27Current price $65.27Out of Stock
Pens and Green Houses Benefits
Pen like pH or TDS testers are easy to use and calibrate. They are sensitive to small changes and can be carried in pocket easily to any place. EC hydroponics is good way to ensure good growth in plants, you can also compare using EC vs PPM to check what works better for your hydroponic garden. Pick from our selection of high quality, water proof pens from brands such as HM Digital and Oakton. Zenhydro offers discount pens online, waterproof hydroponic pens, EC pen, advanced nutrients PPM scale, hydroponic EC and many more. Check out today.